Inner tube for pneumatic tires.



R. C. SPRATLING. tNNER TUBE FOR PNEUMATIC TIRES.

' Patented Nov. 28,-1916.

gothe tire.

3 thread, the inner tube will, by reason of the at itsen'cls by a slip lmotilone of the ten and fcleimed, it being nnderstoed that of the casing '2 with Whieh-it-ie tat-"be 1"1'5ed -.9- changes in the precise embodiment-of the Thus the tubecen be-easily]ineei tediintoi'the invention herein disclosed, can he made with- "easing .2, whereas should the user he 'e'om-.. 1-- in the scop of what is clhimed withont depelled to produce the fold 3 ,withinthe tube Par ing from the spirit oftheinvention.- inorder to-insetthe'tubeiinteftheeasing it I In the accompanying" drawings the prey will-befound to beenehnost irnpoeslbleiope 399. 3 ferred .fo nis of. the invention have been emtion intl'ie ,ebse f sp gmr-tpels'pr -w i shownn. I videdforthafi i fie manly tothe.

said drawings, Figure 1' is'a side ele thickness of-the'rtu 'vationofe portion of. an inner tuliie'in the As has beenpo 105 I Y Y a .tranererse;'sectienthrongh a. tire showing. When it desired-to iinrrnn ernirne rennin: errinn;

INNER TUBE ran rN UMArIcrm-es,

igeeeeee, speqificeflon of Letters n Permit-ed nevi es, 1916. Applit'iition filed Eebrnary 4,1916. Serial No. 16,199.

- To'all whom; it may concern: ner tube inflated by air under pressure so as Be it known that I, Ronn (l. SYRA'ILING, to place the tread portion of the inner tube a citizen of the United States, residing at under transverse 'compreesienj. Fig. 5 is a Opelika, in' the county of Lee and State of view similar to Fig.2 and showing eimodh 60 5 Alnbztma', have invented a nevi and usefulfied form of restraining-means. Fig. 6 is a Inner T .be for Pneumatic Tires, of which view partly in side elevzttion and partly in the following is n epeeifiezrtion. section-of the inner tube restrained by the This invention relates to inner tubes for means shown in Fig. said figure being on pneumatic tires, one'of its objects being to a reduced sea-1e. s I provide, as an ,nrticle of manuiectureian Referring to the figures by characters of inner tube which is previded with reetminreference 1 designates an inner tube formedinef means whereby said-J ub'e is-held in a ,of soft rubber'and having its Wall of 51 thickcollepsed condition/suits to be readily in 'ness rerying'from t; of'a-n inchto one inch, serted into the casing of a, tire efter which, although it is to he understood that it can by the removal of the restraining means, under eome'eonditiens-he made even thicker. the inner tubewill be-free to expand by its The-diameter of the tube is greater then the inherent elestioity sefles to be positioned ,internel'dinmeten of the tire'cesing 2 with with an inwardly annular portion Whichitis to be used and when the tube is back or the tread portio'irqof the easing .of slolcl to the'trarle it'ie provided with an im- 75 L k L nulnr inwardly extending fold 3, the tube A further object'i to evid'e an inner being provided with a restraining means tube which has'com tam-v1 'y thiek rubber whereby it will stay in itefolded-condition walls'so' that when as; under pressure is diuntil released from thejrestraining meens.- rected. into the tubeithe inwardly lmvv'edv One formof restraining means-employed is annular portion will be: forced outwardly tape i wrapped 'around -the tube so asflto. against. the inner surface of the tread perform a continuous cesingnlt-hougli it is to be tion-of the easing-and will be placed under understood that, ifprefe'rr'ed end as shew-n compression transversely so that in the event in Figs. 5 and 6,12, cord Sine}! beexfiended of the. casing or the inner tube being p-unclongitudinally within the fold?) end fastened lateral compression to which it is subjected, minal's' of the cordlining-extended. beyond promptly expand so as to' fili the'puncture ther'o'ld, as shown 3:2;9 so eete .be'ensily ztnd prevent-the escape of air from the tube. grnspedto, cause the knot to be'untied-when "With the'foregoing and other objects in said end 9 is p'ulled. vi i'hen the'tube isin view which will appear as the-description its folded-or eollepedf-condition, 'seid'fend proceeds, thein'vention resides intheeombi- 9 is pulled. When'gre tube-i' inits folded; nation and arrangement of parts and in the or collapsed conditi it's' diameter will; be details of'oonstruction hereinafter described --coneiderebly less than the. inteme-Ydiemeter' boiiditi'on iii-'Whieh itie marketed. 'Figr W is to be; pleaedxin't hi *7. QQfion on line ,Az- -B Fig.1. -Fi'g-.' 3 iswhile in. its told the-inner tnbe seated therein eiter 'the easing Q-it ie in eertedther .,move1 pf.its,restrein'ngmeensend-prior to, restremed cqntht onjian the admission eieir under-pressure to the in-. properly p'c sitmned? f terier ofxthe tube. Fig-ibis e transverse stminin'g meanee ardly sons to form an annular chamber,

the'pieees removed from between the tube and the easing. If a cord 7 is employed the knot 8 can be untied bypnllingon the end 9 after which said cord can be withdrawn from between the tube :mrl'the easing. As soon as the inner tube has been relieved of its restraining means it will expand, by reusen of its-inherent elasticity, until it fits snugly against the inner surface of the ens.- lug/:2 exoeptblong the trend portion of theeasin" The inner tube will here bulge inee will be appn'rent by referring to Fig. 3.

By forcing, air under pressureinto the inner tube, this inwardly bowed portion-indicated at 3 will bje pressed outwardly against the "inner surface of'the tread portion .of the casing-2' and as the"--l ength of the arc ife'rmedvby the inner surface ofthe casing between the sicleeof the inwardly bowed portion is much less than the transverse length of the bowed portion, it will he apparent thzit when this' bowed portion is pres'secl outwendly against the casing the rubber -constitoting"' seid bowed portion will beplaced under-compression transversely with the result that that portion of the inner tube lying dii eetly heck of the tread portion of the ca's'ing' eill be greatly condensed. Thus it will bfseen that should the inner tube be punetu'red along the treadportion, the condensed .rubber formingv said tread portion ofthe inner tube will press, of its inner tube.

own force, into the orifieeso as to coinpletel ykseal 1t andpre-Yent the esen-pe of air {h-Wisycleimed is 1, ile an artxele of manufacture, .an end-,

less inner tube for pneumatie tires having an annular inwardly extended fold and a restraining means for'holcli'ng" the tube in its folded condit on; sud-restraining menus leing ne nemble-ibodily "from the tube;

Anne article of manufneture, an end. lees inner tube ienpneumntac tires, having nected end portio relatively thick $5511 1. offfsoft rubber iai-if,

vided with a single inwardly. extending .a'nA-t nulnr fold,n'nd reetreining means deteelm ably-connected toftl 3; tube for holding it in itefolded eon'clitio'n:f 2 if M "3' As an; artielejofiinnnnfwcture, an endJj-i less inner tuber-fort ,n'ei' matictires,.havin'g relatively thick Xvi ill ,Td'ff eoft' rubber pm 2' viclecl with' a singliiniv'ardly extending-aria 'nnlar fold, anlreetreining meanedetnehg-"b's ably conne'etedi to" he "tube Efor holding it in l extending a: nular fold, "and QSt I EIIimgL COI-fl sea (1. within the fold end 'sivixig' tletachebly co:

In testimony 'tl asmy own; The)v he ture in the preseiz ee f o srnzi r niie; Witnesse 1 a E.- Rosnonon r "Went srmninfonr 

